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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fb633dca3498c8004bd0daddbc548394c6b3eafd648f6afa47914f77f6f53e4' 
  AND token = 'XMtAFX8wSo6GPiVIzSQc8Kg9s/fuaqCPNR27U5fmu/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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