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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69594022e51a96e2699332e00f1b86f562ed52a1e33fbe2fc5b003645d10efb3' 
  AND token = 'MqP3NJsGnDXJH6FiQ5zR2kmMux3NIaeFsWhQDjmfcwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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