SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c33136c8f5117437414c35e2c8551546c04a57064e4ab2d9710cf3464c8218b4' 
  AND token = 'hHYTne6wh4Vzpb7SP/r2zVvx2IguDVb/ncIABqdL+CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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