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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36cbdf866ef39210157c4116803053afbdef5c288c81814aba58ebb723277fa6' 
  AND token = 'wHKFBR6jiBkf8UdRBD9+OPLtaRcZD0p0dFIk/n/lgxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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