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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96635921e8d449466a6129db2268e9db7509215f24d15c7d9e55c73fe7a49066' 
  AND token = 'Yh6fuDGa7BerHlJmUtQPP/K0PknooWlpYKbDRO6MeTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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