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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ee9ce82ceda99a4c0b6d8408e14c5cb97b2ae61fb032ab9dc9da71aabd89c3e' 
  AND token = 'RQhNKZoTw95MEeZH+cLMqlzYkrDDio3/LNw/kkckRoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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