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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '848413eb8b057a78b23b5ef7d249f5a2276b8639a82e6f71509da3d90e45a490' 
  AND token = 'TXSmxH1fjwsN5YEM2pgAFZRZdt2Tjo/8EY99yRFFUOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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