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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce884cb2b43291bbbfffc879db1e48b89f686cc13757d3dba2b8c1fdca68638d' 
  AND token = 'BFx0m41KLTbEuMFBbksLQoMQDLjf+HKAeXOB/qatQd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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