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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a69db4423a55a83782d2339d49ce990a4a6cfae191d64afaec39dbc2f6ee4bf' 
  AND token = 'yOaOnutxrnqPiNpUY4szdL+mKNwWs9M/aDYfW62gPv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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