Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '476b9afab6c97ae628e5e243f9799c8fb0eaa250ceedb4601e00d0baf413ee3e' 
  AND token = 'OKBQPouxJf8XyLuph5B3yzd+bvcJOEI2cX/vk4d+nTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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