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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74aeee15df7c63b7c8606e74ff216ec8f3126a7b7a9a262a3bb5d5fde8df2013' 
  AND token = 'DOjsr6dtC6UvsGlOBh9nbZGh8iPIaOTe4aLFrgHYNqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}