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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5e08cc3b0ecf6931d7b671a43777f76b7bf61fc390a75b40ed299b1d12cae02' 
  AND token = 't58BfiqdpAui5Ef0fbIkqST4DEg+IIcswTSOwfEfgA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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