SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e804c63d89f0b5f38f667d0bf2bcca736e752a448ac22784f95971ca78e4a1e9' 
  AND token = 'Ci1l3bY4DJBhieXE4ZnLpNVZlnby5xYw8/y7UgQqJy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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