SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25dde1ecd3099c6a6eb22b72882d4fd53d5bc5919d93b54826eed38bea8cf036' 
  AND token = 'UInABamz1/eqS47RoDsspElLXLJvUKNCp1ZH+sdsjto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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