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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '540daecda3f47ddcde6423bfb12ca4253fdbdf563023717f60b7e95eda054745' 
  AND token = 'HJ43592JPYUu7173agAEiAl346O5ZXeyIsIYnx1yv/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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