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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '175223519591180ea7e864608751e18781a9d78f713da7e0f40c8550a77e3b6a' 
  AND token = 'CzjJByipEftJs8Ys6Gufpx5o4EZwKdX1sLZr8CXSKR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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