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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4394900f6d3818f6d87cac2dd245397d4445e50996810924141e9795c33554f4' 
  AND token = 'xTDpIUmvR7zSe+e9H+S06UyWagLpzZ2g6vPT6iEO9WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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