Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '521e1718ec26a1e96d7e774c4554473b48ff4d83e476e70eb2e4071cc84a9b6a' 
  AND token = 'NFnnFGfT8sddIa42vlcAiNdpY0Mvq/j+gwokD+VF4TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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