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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f25223751c32b10964c22996fe4c85032f9643370f3a813dae534e63e33eb611' 
  AND token = 'ueXTKxkoJF7dswkY1J0E8U5v3kgCFU2w3XeaS3Kq2Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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