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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b598a8745facf9bbb594f61553918ea8aa69c074a3e4b6a0e831c158be65c740' 
  AND token = '7HbUlTk9dAxOXlwU1Ic/aezdpcpm10e28ZYzrtBTJ+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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