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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aae72a0b85788aae421a68879a7c4af4fa77ba20708df7468c2b4348706020f1' 
  AND token = 'maJksT8OBZELCbrg4844M4RKu0tLK53zNb1UJLyM8SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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