Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b12ef3eb980d26ee02f64bdbe391e800fa659c93fc15fd90002a0cae244d908a' 
  AND token = 'j5lSarMJN9Pu8pt08kXeDjSLv0bPcl+h5MXsKN6M0yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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