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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8a571f2c0be08975ad8fa360010418ebfcfd47705ba81eb9a82c32648e58446' 
  AND token = 'iDzfOLz5YASxoX7i753CdbdR4pjyREvuyB+Xrhy4qIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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