SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d15d2c4f02cbf97977a57363e4570e0c6ed406f7b3a3e9e5e4f28412683b1ee' 
  AND token = 'Zk8NKOKsQB61jsWAg3z+KhUlyuwC4J7gihGTCGzhyOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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