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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9ec46f0cff960cf7e554f08f904bbb6cb93e019925a6363ec337d810196d1ea' 
  AND token = 'W7kIBfk37QHKPrFQngKf1VLlMkRXSlP64fhdKWpD3I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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