SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a617701b4526761c4246c344268e3668ccf34ba84b48fb19fce96879d90b018b' 
  AND token = 'l2ws+li/sUiHIEMtHPy+O0Dh8kUIBQQVhjaKGhs6S3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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