SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c0b4dd0729629b89db634fb87f9dd7be493ec781575d8dc858a98e2175dbb81' 
  AND token = 'KjTQ6kAM5r/oLYVr+jHMikO/hyx7LKlDwU6kAvaC73g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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