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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77ebe9038c2fab577f2a79d238945d40fca9326aa5ce93dc97f22f1afa8f01ee' 
  AND token = '8Lfvd27buFTC0Qs4W0T2j0VJr/fedIRBA+6O2vUDKCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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