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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26b1f2b8a1538949320a9dc3389e5b458be2c166b04940777e2e9c707b4becb6' 
  AND token = 'TckuX8KtK5YXs9CyraIx/XVAn4pRrSrNZOGzuWvWMMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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