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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99cbfc82c372da0f3c95c0f0e31d8826ca68b8fadbc5d024eb1cf83c79cc332c' 
  AND token = 'uZhG0j0P/O0zRfhr+wzoSH3AomIA4WSfjZ25Cky1A30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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