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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78a55084696d5e95ffb684d42f2760fe4b14b0256ee0cf5a7529b00702614ec6' 
  AND token = 'i6F6suEUNad4g5UwnMLU5lqL8Vc/1TaurOIurEdZsuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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