SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e37888638dcd7309b938c4398fb94622f71882d6ebb3e238ff1ab291e3c4f216' 
  AND token = 'iWepRPLiJUQxBtuh+ZneHwfVVJaqCpe+bAoSg5kXQyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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