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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33bb49c6505cc0580664ffe67f7947a463c2cbe712fb08d96c9baec142e7e2f0' 
  AND token = 'tJTSte6a+j2yNUpJNTVQBHsMjvaiW4EPK7bi8PX6Qko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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