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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff85c76442e065b855d61e0521036cd45c1ffe4a591ccc8b98e3468ff8c6acef' 
  AND token = 'IAYbCswa7nPQa9kdaH34JIFzZ9sa8HIpJXSaYQx23FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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