SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1658f445ad243276e28835c14b1a2d7b67a2c8306df352acdde969703f2abc64' 
  AND token = '3S/BCl+SE56vHNKR/tjoE4NZv6Jwhb1VcLl8PRYwHsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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