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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10c93a11b971c1056316897de347433d1847a44c04399bbf4bd49d44a3d9ff08' 
  AND token = 'vRT3Krtq2RPzZkcN6I/2keNfP19Xd9X1DDuT5jFe3II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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