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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '158333f0e18450886ca379a8f0f4be7dbaed0ade36db3888c79e4f558ad69b95' 
  AND token = 'd5YgFLfVALd8TZ/HJ9ekxTqHS8GyPdWy62GeK4nPjJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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