Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '212cb192e676af0c39133a5c02bcc638018f970c6f03d61bdadfbf0098b8c584' 
  AND token = 'o0fe8e9hfIL8sJD+Qps3xM4xZbiufrIiefHumqDVEVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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