SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed80318b88907f738d4785708da5068c6e3c376483611203403ac20f59783cc3' 
  AND token = 'OTjO/GjUQ4xy1WkELuxbMBgKWw1PJlVDYI3FY4+ipUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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