SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e52686df3eba43b719610a1bfe605b82f5c332d1972827b6bc95a7370d4d9cf0' 
  AND token = '3S5kXyjX/uF5BGPXi+/Upkhuj/2M+esxCDoHno1zjkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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