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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fb4276952ca06cc12cfa742b7909f57bc5b5c4421719518420ee0e7795b6461' 
  AND token = 'cElS9Bajyu7JKaG94D1/OUpZM562HCwiin6AEsCepz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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