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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15a5fd6bb0259dd3798cb03270218a6e225f21e472aa52a1a7988724e73d1ad1' 
  AND token = 'n/4eNG5lFiNfLPbbCB4THlHLB/Jpdt9dNwrQBRBsxiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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