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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '962988c5389e90b5ea39f2fff750441a70b5a65dc5fb2d2da81e99b192d5a2a9' 
  AND token = 'cfxyaFM+cV1X5mU/DpXxlW2zyuwvtRw26SvFvJQvLmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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