SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4554b5740929aae28e3db41acdfaaabe26b754e2174aa6214fa3a02d035eb9d' 
  AND token = '+jwPZgZz2/DqJSQzRMrPMYAQEySs4SV6qk5/MurGTHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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