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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c67f7e2c7dcaa19cc077a3b445ed800423eeb5490c057587e7f6dc42962408c8' 
  AND token = 'RBq+oKJYIUqk8YpbT5Whnc1bTcGpY6hjTHTIRDd26oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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