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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f08dd18cb74d3758534f5e53b1a4590c6c218baa6a266682587edc894abdafc' 
  AND token = '48+BB5d8ooVa6bDUm/CSlVIr/OpaposCNIs5ILw3Law=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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