SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2565e8a9860c525f8bb8749233127c104bcdd3812dc0cd554c35a3c9f6450a71' 
  AND token = '52Os8PKe9iJ3CkUwZFsvi3ZWf1knlXTmY54+NuuBbVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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