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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '221b3b982cc3b679cc1625b892e87a349a737e8866003b8c8639411c45248be2' 
  AND token = 'EkUXFpIHR297WhAHVxSKom6t+UcbqX1tOHfc5KQPMe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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