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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f6a37ecf2c89724f56ad3dabe4ae28b1b92703d5adf8b2bed869713f574db40' 
  AND token = 'cm/oWl2a/ZNjwbak2+sLPZ/8ULR00nYoAumXP8ZDslI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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