SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d0c5fa72abdaa59c4812e6b0171ba16cb15d8df6ffe8c149d9d98684cf3273f' 
  AND token = 'Sk4XD9KT3iMkbyfhj5JQ3mStX+xgVKpwmukxPqePBHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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